One of the most majestic riddles in our world is the Riddle of the Sphinx. She lays there, partially buried, serene in the sand. How old is she? Why was she built? Does she guard the pyramids, or does she predate them? Was she constructed by a powerful pharaoh with the face of his favourite partner and built by an army of underdog slaves? Or was she placed there by some mysterious alien race to kick-start a civilisation on earth? Many stories have been written, but none have come close to the truth. It is a riddle that will never be solved unless scientists bypass the universal laws of physics and invent some kind of time travel device. Some wonders are not meant to be understood, only enjoyed.